Lau, Kah Siew (2005) Sythesis of banana shape liquid crystals and determination of phase transition behavior. Universiti Malaysia Sabah. (Unpublished)
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Abstract
This thesis has attained it objective specifically synthesized liquid crystal compound that exhibit mesogenic properties and banana shaped structured. Starting material for this project was ethyl 4-aminobenzoate. The initial step was diazonium salt coupling reaction with 4-flourophenol to obtain 4-(4-ethyl-diazobenzoate) fluorophenol, which melting point at the range 170 - 172° C. The next reaction was Wil1iamson eter reaction with l-bromohexadecane to obtain [4-( 4-ethyl-diazobenzoate) fluorophenoloxy] hexadecane that melting point at the range 81 - 84° C. Ester was converted to acid form by hydrolyzed with strong alkali to obtain [4-(4-ethyldiazobenzoate) fluorophenylazo] benzoic acid that melting point comes at the range 196 - 200°C. Product formed was undergoes esterification reaction with catechol, DMAP and DCC to obtain 1,2,-phenylene bis [4-( 4-ethyl-diazobenzoate) tluorophenylazo] benzoate. This compound has melting point at the range 104 - 108°C. Functional group in each product formed will compared with the functional group of the product formed in the next reaction with FT -lR. It has been discovered that all product formed have functional groups such as azo group, C-H bending, C=O stretcing, phenol group and C-O-C bonding.
| Item Type: | Academic Exercise |
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| Keyword: | liquid crystal, exhibit mesogenic, banana shaped structured, azo group, reaction |
| Subjects: | Q Science > QD Chemistry |
| Department: | SCHOOL > School of Science and Technology |
| Depositing User: | SITI AZIZAH BINTI IDRIS - |
| Date Deposited: | 31 Oct 2013 15:48 |
| Last Modified: | 17 Oct 2017 13:17 |
| URI: | https://eprints.ums.edu.my/id/eprint/7452 |
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